Moving over player data to 20w14a causes internal server error

To put it bluntly when I try to transfer over player data for a new map (we are starting new for 1.16 with inventories making the transfer) if I load it in 20w13b I get no issues... however I get the following error if I do it in 20w14a:

[14:45:47 INFO]: UUID of player JediMasterKenJen is ebff767a-9927-4fb6-8b81-526b8c0656e9 [14:45:49 WARN]: Failed to handle packet for /69.54.137.187:64718 s: Loading entity NBT at anc.f(SourceFile:1625) ~[server.jar:?] at cxn.b(SourceFile:130) ~[server.jar:?] at aav.a(SourceFile:311) ~[server.jar:?] at aav.a(SourceFile:127) ~[server.jar:?] at ze.c(SourceFile:111) ~[server.jar:?] at ze.b(SourceFile:63) ~[server.jar:?] at ly.a(SourceFile:230) ~[server.jar:?] at zb.c(SourceFile:171) [server.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:864) [server.jar:?] at xk.b(SourceFile:345) [server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:791) [server.jar:?] at net.minecraft.server.MinecraftServer.run(SourceFile:650) [server.jar:?] at java.lang.Thread.run(Unknown Source) [?:1.8.0_241] Caused by: java.lang.NullPointerException at lk.a(SourceFile:168) ~[server.jar:?] at ky.a(SourceFile:150) ~[server.jar:?] at aoh.a(SourceFile:119) ~[server.jar:?] at aof.a(SourceFile:185) ~[server.jar:?] at aog.a(SourceFile:106) ~[server.jar:?] at v.a(SourceFile:339) ~[server.jar:?] at aog.a(SourceFile:102) ~[server.jar:?] at ann.a(SourceFile:606) ~[server.jar:?] at bch.a(SourceFile:822) ~[server.jar:?] at yl.a(SourceFile:229) ~[server.jar:?] at anc.f(SourceFile:1616) ~[server.jar:?] ... 12 more [14:45:49 INFO]: com.mojang.authlib.GameProfile@6c0089[id=ebff767a-9927-4fb6-8b81-526b8c0656e9,name=JediMasterKenJen,properties={textures=[com.mojang.authlib.properties.Property@125c5d2]},legacy=false] (/69.54.137.187:64718) lost connection: Internal server error

no one else but me can connect.